Figure 42.1: Species Are Patchily Distributed on Several Spatial Scales (A) The geographic range of Edith’s checkerspot butterfly (Euphydryas editha) extends from British Columbia and Alberta to Baja California. (B) Within the geographic range, the butterflies occur in patches of suitable habitat which, in the San Francisco Bay area, are on serpentine soils. Arrows indicate colonization events that are discussed in Concept 42.5.